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Microstructural and flexural strength of various CAD-CAM lithium disilicate ceramics
Joissi Ferrari Zaniboni1,2, Amanda Soares Silva1, Aryvelto Miranda Silva3
1Department of Restorative Dentistry, School of Dentistry, Araraquara, São Paulo State University (UNESP), Araraquara, São Paulo, Brazil.
Summary
This study found that various commercial lithium disilicate ceramics for CAD-CAM systems exhibit similar flexural strength, despite microstructural differences. All tested ceramics showed comparable crystalline intensities.
Area of Science:
- Dental Materials Science
- Ceramic Engineering
- Biomaterials
Background:
- Lithium disilicate ceramics are widely used in CAD-CAM dental restorations.
- Understanding their microstructural and mechanical properties is crucial for clinical success.
Purpose of the Study:
- To analyze and compare the microstructural and mechanical properties of different commercial lithium disilicate ceramics.
- Evaluate variations in crystalline structure and flexural strength among brands.
Main Methods:
- Five commercial lithium disilicate ceramic brands were tested: e.max CAD, Rosetta SM, Evolith, Smile-Lithium CAD, and HaHaSmile.
- Microstructural analysis utilized X-ray diffraction (XRD) and scanning electron microscopy (SEM).
- Flexural strength was determined using a three-point bending test and analyzed with ANOVA and Weibull analysis.
Main Results:
- All ceramics displayed similar lithium metasilicate and lithium disilicate crystalline intensities via XRD.
- SEM revealed distinct microstructural patterns between e.max CAD/Rosetta SM and the other three groups.
- No statistically significant differences in flexural strength were observed among the tested ceramics (p = 0.28).
Conclusions:
- Commercial CAD-CAM lithium disilicate ceramics demonstrate comparable flexural strength.
- Microstructural variations exist among brands, with e.max CAD and Rosetta SM showing similar crystalline structures.
- These findings suggest that material choice may not significantly impact mechanical performance in terms of flexural strength.
